Electrostatic charge image developing toner, electrostatic charge image developer, and toner cartridge

Abstract

An electrostatic charge image developing toner includes toner particles containing a binder resin, and an external additive including silica particles having a compression aggregation degree is from 60% to 95% and a particle compression ratio is from 0.20 to 0.40, and resin particles containing a polymer obtained by polymerizing a (meth)acrylic acid ester monomer.

What is claimed is: 
     
       1. An electrostatic charge image developing toner comprising:
 toner particles containing a binder resin; and 
 an external additive including silica particles having a compression aggregation degree is from 60% to 95% and a particle compression ratio is from 0.20 to 0.40, and resin particles containing a polymer obtained by polymerizing a (meth)acrylic acid ester monomer, 
 wherein the silica particle is a silica particle which is surface-treated with a siloxane compound in which viscosity is from 1,000 cSt to 50,000 cSt, and in which a surface attachment amount of the siloxane compound is from 0.01% by weight to 5% by weight. 
 
     
     
       2. The electrostatic charge image developing toner according to  claim 1 ,
 wherein an average equivalent circle diameter of the resin particles is from 200 nm to 2,000 nm. 
 
     
     
       3. The electrostatic charge image developing toner according to  claim 1 ,
 wherein a particle diameter ratio (D(si)/D(r)) of an average equivalent circle diameter (D(si)) of the silica particles and an average equivalent circle diameter (D(r)) of the resin particles is from 0.048 to 0.650. 
 
     
     
       4. The electrostatic charge image developing toner according to  claim 1 ,
 wherein the resin particle includes methyl (meth)acrylate and cyclohexyl (meth)acrylate. 
 
     
     
       5. The electrostatic charge image developing toner according to  claim 1 ,
 wherein the average equivalent circle diameter of the silica particles is from 40 nm to 200 nm. 
 
     
     
       6. The electrostatic charge image developing toner according to  claim 1 ,
 wherein a particle dispersion degree of the silica particles is from 90% to 100%. 
 
     
     
       7. The electrostatic charge image developing toner according to  claim 1 ,
 wherein an average circularity of the silica particles is from 0.85 to 0.98. 
 
     
     
       8. The electrostatic charge image developing toner according to  claim 1 ,
 wherein the silica particle is a sol-gel silica particle. 
 
     
     
       9. The electrostatic charge image developing toner according to  claim 1 ,
 wherein an average circularity of the toner particles is from 0.94 to 1.00. 
 
     
     
       10. The electrostatic charge image developing toner according to  claim 1 ,
 wherein the siloxane compound is silicone oil. 
 
     
     
       11. An electrostatic charge image developer comprising:
 the electrostatic charge image developing toner according to  claim 1 . 
 
     
     
       12. A toner cartridge comprising:
 a container that contains the electrostatic charge image developing toner according to  claim 1 , wherein the toner cartridge is detachable from an image forming apparatus.